From Tulsa to where?

I'm planning to go to Tulsa, OK in may 2012.
But after Tulsa..where to go?
I've only been to New York (I'm from the Netherlands).
And I love to see LA, Las Vegas, Grand Canyon, all the big sight seeings in the USA.
But what's possible and what would you recommend?
I'm planning to go for 3 or 4 weeks.
Any advices and suggestions are welcome!!

only you can answer

Welcome to the RTA Forum!

The "Where to" is a frequent question on this forum, but it is one that only you can answer. With 3-4 weeks, you can really go pretty much anywhere in the US. And "All the big siteseeing" is an impossible question with millions of possible stops.

But it appears you've actually taken a step to answer your own question. You say you want to see LA, Vegas, and the Grand Caynon - so that's an excellent place to start. From there, you've got lots of thing you could add on. There are many more national parks in the 4 corners area - like Arches, Canyonlands, Bryce Canyon, Zion, Mesa Verde, and Monument Valley Tribal Park. You can also look at California - like the Pacific Coast Highway, Yosemite, Sequoia, Death Valley. And there are many more options beyond that, but you need to figure out what the right answers are for you.

Once you have a better idea of what looks good for you, then we can help you put it all together.